干涉式光纤陀螺跨条纹工作误差研究
Research on the Cross-Fringe-Operation Error of FOGs
赵海波 1莫馁 1李旭东1
作者信息
- 1. 中国电子科技集团公司 第二十六研究所,重庆 400060
- 折叠
摘要
在干涉式光纤陀螺中,当调制信号超出限制并进行 2π复位时,调制信号输入的调制量与输入角速度间出现了 2π的相位差,这使实际的干涉相位出现左移或右移 2π,即跨条纹工作.在光纤陀螺闭环系统中,跨条纹工作产生的误差体现在随机游走系数和非线性度上.该文通过优化调制方案建立跨条纹误差抵消机制,可使跨条纹产生的误差互相抵消,从而提高光纤陀螺的非线性度和随机游走系数.经过仿真和实验表明该方法有效.
Abstract
In interferometric fiber-optic gyroscopes(FOGs),when the modulation signal exceeds the limit and undergoes a 2π reset,a 2π phase difference appears between the modulation amount of the modulation-signal input and the input angular velocity.This causes the interference phase to shift left or right by 2π,i.e.,a cross-fringe op-eration.In a FOG closed-loop system,the error caused by the cross-fringe operation is reflected in the random-walk coefficient and nonlinearity.In this study,a cross-fringe error-cancellation mechanism is established by optimizing the modulation scheme,which can cause the cross-fringe errors to cancel each other,thus greatly improving the nonlinearity and random-walk coefficient.After simulated and physical verification,the results show the effective-ness of this method.
关键词
光纤陀螺/调制解调/非线性/跨条纹误差Key words
fiber optic gyroscope/modulation/demodulation/nonlinearity/cross fringe error引用本文复制引用
出版年
2024
NETL
NSTL
万方数据